This study investigated the changes induced on nylon 6,6 fabric by a mixture of proteolytic and lipolytic enzymes. Technical measurements were studied including those of Fourier-transform infrared spectroscopy (FTIR), thermal gravimetric analysis (TGA), weight loss (WL), bending lengths (BL), scanning electron microscopy (SEM), moisture absorbency (MA), and reflectance spectroscopy (RS). For this purpose, nylon 6,6 fabrics were treated separately with different concentrations of protease and lipase mixtures in solution. The dyeing process was then carried out on the treated fabrics with two reactive and acid dyes. The intensity of major peaks in the FTIR spectra of the protease-treated samples is in favor of chemical changes the polypeptide functional groups in the fabrics. Thermal studies also show a significant decrease in the thermal degradation temperature of the treated polymer at temperatures higher than 400°C. The protease and lipase mixtures decreased the sample weight, while lipase intensified the weight loss comparing with protease. It was observed that the concentration of lipase enzyme had a direct influence on the darkness of dyed samples.
This work was carried out to characterize the changes induced on wool fiber by clay treatment. Technical measurements were studied including Fourier-transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), thermal degradation analysis (TGA), scanning electron microscopy (SEM), moisture regain measurement (MRM), and tensile strength test (TST). The intensity of major peaks in FTIR spectra of the clay treated sample is in favor of chemical changes of the polypeptide functional groups. DSC results indicated that clay treatment of wool enhances heat and thermal barrier properties of fiber. TGA results stated lower thermal degradation of clay treated wool compared with untreated one. One of the main advantages of clay application on wool could be its positive effect on the moisture absorption of wool.
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